% Functions can be passed to other functions using the 'proctype'
% type generator. The same works for iterators, using 'itertype'

% Here are two functions
square = proc (n: int) returns (int) return (n*n) end square
cube = proc (n: int) returns (int) return (n*n*n) end cube

% Here is a function that takes another function
do_calcs = proc (from, to: int, title: string,
                 fn: proctype (int) returns (int))
    po: stream := stream$primary_output()

    stream$putleft(po, title, 8)
    stream$puts(po, " -> ")
    for i: int in int$from_to(from,to) do
        stream$putright(po, int$unparse(fn(i)), 5)
    end
    stream$putc(po, '\n')
end do_calcs

start_up = proc ()
    do_calcs(1, 10, "Squares", square)
    do_calcs(1, 10, "Cubes", cube)
end start_up